<2. WIRING AND INSTALLATION>
2-11
IM 12A01F01-02EN 2nd Edition : Feb. 19, 2019-00
2.5.3 Wiring network cables
FLXA402 provides two types of wired digital network, Ethernet (Modbus TCP/IP) or RS-485
(Modbus RTU).
Use shielded cable to avoid deteriorated performance caused by EMI disturbance or radiation
eects on electric devices.
n RS-485 cabling
Sux code -R is specied, i.e. (Modbus RTU (RS-485)) of digital communication.
All screws for the network module terminals are M3 with washers.
Terminal
number
terminal
name
Application
94 SHILD Shield
93 GND Signal ground
92 B- data-negative
91 A+ data-positive
95 Term
terminal for termination resistor (110
Ω)
Figure 2.10 Network module terminal
Use multi-core shielded cable whose core wire is twisted pair. Connect them to terminal 94.
According to your network environment, terminate the network by using the built-in termination
resistors with a value of 110 Ω.
Jumper terminals 91 and 95 with each other with a supplied jumper. (Figure 2.11) The jumper
terminates signals inside the module. In this case, the screw of terminal 91 is tightened with the
signal cable and the jumper all together.
Figure 2.11 How to terminate RS-485 connection
NOTE
If you don’t need the termination, keep the jumper in the jumper holder attached to the back of
the front panel to avoid losing it. (Figure 1.4)
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